5.9-4用字符串生成器给字符串str追加1~10这10个数字

 package zfc;

 public class ZfcShcq {

     public static void main(String[] args) {
         // TODO Auto-generated method stub

         StringBuilder str = new StringBuilder("hello world!");

         for(int i = 1; i <= 10; i++)
         {
             str.append(i);
         }

         System.out.println("字符串str追加后变为："+str);

         }

 }